pinctrl: add TB10x pin control driver

The pinmux driver of the Abilis Systems TB10x platform based on ARC700 CPUs.
Used to control the pinmux and is a prerequisite for the GPIO driver.

Signed-off-by: Christian Ruppert <christian.ruppert@abilis.com>
Signed-off-by: Pierrick Hascoet <pierrick.hascoet@abilis.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index 85f5462..e283c49 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -321,6 +321,10 @@
 	depends on SOC_TYPE_XWAY
 	depends on PINCTRL_LANTIQ
 
+config PINCTRL_TB10X
+	bool
+	depends on ARC_PLAT_TB10X
+
 endmenu
 
 endif